Mechanical Factors Affect The Output Of Ball Mill

1. The ventilate in the ball mill barrel

1. The ventilate in the ball mill barrel

The fine ventilate in the ball mill will lower the temperature, discharge the moisture, decrease the excessive grinding and improve the grinding efficiency. It has been proved that the wind speed in closed process grinding ball mill should be kept around 0.8-1.0m/s, while that of the open process grinding 1.0-1.2m/s, thus the demands of energy conservation and high yield can be met. Also we can choose the type of the ventilator according to the actual output of ball mill

2. The inner structure of ball mill

The inner structure of ball mill refers to the lining plate, comb plate, cabin isolation plate, feeder unit and discharge device in the ball mill barrel.

At present, the shaft kiln cement enterprise adopts ball mills of 2.2m specification or below. Although the ball mill is newly purchased, the drawings used for making the ball mill are from the design information in 1950s and 1960s. For example, the feed port is 900 degree, right angle feed, the screw blade angle of grinding head feed is 370 degree, but the cabin isolation plate position and lining plate form are the same as before. So the bad phenomenon appear which confine the energy conservation and high yield of ball mill, such as there is material stagnation zone in the feed port, the federate is slow, the ventilation area is affected, the unbalance grinding to each freight space of the precomminuted material, and the low grinding efficiency. It is necessary to make proper adjustments to the ball mill structure.

3. The gradation and fill rate of grinding body

The traditional gradation method and fill rate design cant meet the demands of present energy conservation and high yield ball mill due to the changes of grinding technology conditions. Do the necessary freight space grinding body dynamic test and calculate by the actual feed material granularity, grind ability factor (or the relative grind ability factor) , lining plate and cabin isolation plate form, installation position, mill power, rotation speed and so on.

It has been found that add the precomminution technology before grinding, improve the inner structure of ball mill, choose the high efficient powder concentrator after grinding is the main route to realize the high quality, energy conservation, and high yield of ball mill.

by: jocelyn

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